Agricultural engineering / prep. by the National roster of scientific and specialized personnel Forestry / prep. by the National roster of scientific and specialized personnel Agronomy and soil science / prep. by the National roster of scientific and specialized personnel Entomology / prep. by the National roster of scientific and specialized personnel Geology / prep. by the National roster of scientific and specialized personnel Civil engineering / prep. by the National roster of scientific and specialized personnel Horticulture / prep. by the National roster of scientific and specialized personnel United States at war : development and administration of the war program by the Federal Government 25 jaar A.K.W.V. conflit italo-colombien (affaire Cerruti) : la condition des étrangers en droit international public et les lacunes de la procédure arbitrale internationale / Paul Bureau aandeel van enkele indirecte belastingen en landbouwcrisisheffingen in de gezinsuitgaven / Centraal Bureau voor de Statistiek 10 jaar arbeidsanalyse, 1950-1960
